Deploy Docker images with anyuid SCC

Deploy Docker images with `anyuid` SCC

Starting with version 7.9, it is possible to run the APM Server with the restricted SCC. For APM versions older than 7.9 and Enterprise Search version 7.9, you can use this workaround which allows the Pod to run with the default uid 1000 by assigning it to the anyuid SCC:

Create a service account to run the APM Server:
```
oc create serviceaccount apm-server -n elastic
```

Add the APM service account to the anyuid SCC:

oc adm policy add-scc-to-user anyuid -z apm-server -n elastic

scc "anyuid" added to: ["system:serviceaccount:elastic:apm-server"]

Deploy an APM Server and a Route with the following manifest:

cat <<EOF | oc apply -n elastic -f -
apiVersion: apm.k8s.elastic.co/v1
kind: ApmServer
metadata:
  name: apm-server-sample
spec:
  version: 8.15.3
  count: 1
  elasticsearchRef:
    name: "elasticsearch-sample"
  podTemplate:
    spec:
      serviceAccountName: apm-server
---
apiVersion: v1
kind: Route
metadata:
  name: apm-server-sample
spec:
  #host: apm-server.example.com # override if you don't want to use the host that is automatically generated by OpenShift (<route-name>[-<namespace>].<suffix>)
  tls:
    termination: passthrough # the APM Server is the TLS endpoint
    insecureEdgeTerminationPolicy: Redirect
  to:
    kind: Service
    name: apm-server-sample-apm-http
EOF

To check that the Pod of the APM Server is using the correct SCC, use the following command:

oc get pod -o go-template='{{range .items}}{{$scc := index .metadata.annotations "openshift.io/scc"}}{{.metadata.name}}{{" scc:"}}{{range .spec.containers}}{{$scc}}{{" "}}{{"\n"}}{{end}}{{end}}'

apm-server-sample-apm-server-86bfc5c95c-96lbx scc:anyuid
elasticsearch-sample-es-5tsqghmm79 scc:restricted
elasticsearch-sample-es-6qk52mz5jk scc:restricted
elasticsearch-sample-es-dg4vvpm2mr scc:restricted
kibana-sample-kb-97c6b6b8d-lqfd2 scc:restricted

« Deploy a Kibana instance with a route Grant privileged permissions to Beats »